Thread: Misfire Misery
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Old 06-08-2021, 12:26 PM
Effduration Effduration is offline
Join Date: Apr 2019
Location: Boston, MA
Posts: 408
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Okay, so I looked one code up
P1419 is related to the secondary air MAF sensor.

An '04 X5 is going to have the later secondary air system. There are no vacuum lines in the later system to cause a vac leak. OP should investigate the whether the secondary air system is working, but it is easy to test.. Does the pump come on for 30-50 seconds on a cold start? The secondary MAF may be bad. you can also remove secondary air check valve, blow thru it and see if it is clogged.
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